Hold'em table

Button with weak offsuit low connector 5s6d facing a raise-like BB in 3-handed; not worth investing, fold preflop.

J4o is too weak to complete or raise out of position against the big blind after the button folds. Folding avoids putting more chips in with a dominated, low-playability hand.

A2o is easily dominated and too weak to open first in from the button for a full big blind.

On the button 3-handed with 78o, I have position and fold equity; a standard 3x open pressures the blinds while keeping my range wide. Calling is fine but raising builds on my positional advantage.

6-8 offsuit is weak; folding to a raise is standard here.

2-5 offsuit is too weak to continue against a button open, so folding is the highest-EV option.

Button raise with King-high offsuit hand in a 3-handed pot; standard steal-sized raise to apply pressure on the blinds.

Pocket sixes is ahead of a typical button open often enough to continue, and calling 200 keeps the price right to set-mine or realize equity while the big blind is still behind.

J5 offsuit is dominated by the button's raising range and the SB's calling range, and playing out of position with a weak kicker invites costly postflop spots. Even at 150 to call, folding is the profitable play.

I flopped a set of sixes on 4-6-8 and act first heads-up. A two-thirds pot bet builds the pot and charges straight and overcard draws while keeping worse pairs and draws in.

Top pair with a king kicker on a wet board; raising for value and to charge diamond draws.

I have a set of sixes on a draw-heavy board and seat_1 has already raised my flop bet, so I raise for value and protection rather than flat. 3200 builds the pot while keeping worse made hands and draws in.

Seat_2's aggressive re-raise to 3200 after my flop raise strongly suggests a set or made straight; my top pair with backdoor flush draw isn't strong enough to continue against that level of aggression.

J7o is playable as a button open in three-handed poker, and raising is better than limping. A 2.5bb open takes the initiative and lets me play the hand in position.

T7s is too weak to defend the small blind against a 2.5x button raise, especially with the big blind still to act behind me. Folding avoids playing out of position with a hand that is frequently dominated.

87o is weak out of position facing a raise; not worth calling or reraising.

K6s is a standard button open in 3-handed play; raising builds the pot with position and applies fold equity against both blinds.

9-2 offsuit is a trash hand facing a raise; folding is clearly correct.

K9 offsuit is dominated too often and plays poorly out of position against a button open, so folding is the higher-EV choice.